A136243 Numbers k in A008864 such that k^2 - k - 1 is prime.

3, 4, 6, 12, 14, 20, 32, 42, 54, 60, 84, 90, 102, 104, 132, 150, 164, 182, 192, 194, 200, 234, 242, 264, 282, 332, 350, 374, 402, 420, 432, 434, 450, 462, 464, 500, 542, 570, 572, 660, 674, 684, 692, 710, 740, 744, 762, 770, 810, 864, 882, 942, 1014, 1040

Offset

1,1

Comments

See A053185 for the primes associated with a(n).

Links

Table of n, a(n) for n=1..54.

Formula

a(n) = A053184(n) + 1.

Prog

(PARI) isok(k) = isprime(k-1) && isprime(k^2-k-1); \\ Michel Marcus, Dec 19 2022

Crossrefs

Cf. A008864, A053184, A136242.

Sequence in context: A000114 A310006 A294144 * A250985 A051592 A044843

Adjacent sequences: A136240 A136241 A136242 * A136244 A136245 A136246

Keyword

nonn

Author

Lekraj Beedassy, Dec 24 2007

Extensions

a(20)=194 inserted by Georg Fischer, Dec 18 2022

Status

approved